window.onload = function(){
	let showBtn = document.getElementById('showBtn');
	let detailetBox = document.getElementById('detailetBox');
	detailetBox.style.display == 'none';
	showBtn.onclick = function(){
		if(detailetBox.style.display == 'none'){
			detailetBox.style.display = 'block';
		}else{
			detailetBox.style.display = 'none';
		}
	}
}